c++winapidrag-and-dropolefile-type
File-Drop mechanism of some associated filetypes (.zip, .rar,...)
I would like to know , how file manager like WinRAR manage it to enable Drag & Drop support for their archive file (when a file is dropped on a .rar-file it opens and optionally WinRAR adds the file to archive).
Image for demonstration: 
EDIT: After some comment, I want to clarify what I want to do (see Image):
- Files of a certain data type accept a Drop request (.rar).
- Dropping the file (.txt) result in a Shell-call that passes the name of the dropped file (.txt) as well as the name of the file which accepted the Drop (.rar).
- The application registered to the file type is called, both filenames are provided to it in the command line.
Solution
You need to implement a Shell Drop Handler.
This is a COM object which implements the IPersistFile and IDropTarget interfaces. IPersistFile will tell you which file is being dropped on. IDropTarget will give you an IDataObject to tell you which files/data are being dropped.
The documentation is here:
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